> On 28 Jan 2019, at 18:00, [email protected] wrote:
> From: Matt Wette <[email protected]> > Subject: Re: Matrix or array operations library > Date: 27 January 2019 at 19:41:57 CET > To: [email protected] <mailto:[email protected]> > … > Also, is it possible to get a pointer to the first element of an array > (i.e., it's #f64() root vector), for the purpose of using with FFI? Yes, you'd do (bytevector->pointer (shared-array-root ARRAY) (* (shared-array-offset ARRAY) (sizeof TYPE))) you can get the type with (array-type ARRAY), only that returns a symbol that has to be translated to the values that sizeof accepts (int double float etc), those are in (system foreign). Maybe it would be a good idea to have sizeof accept 'f32 'f64 etc directly. Here's an full example for FFTW. https://github.com/lloda/guile-ffi-fftw/blob/master/mod/ffi/fftw.scm <https://github.com/lloda/guile-ffi-fftw/blob/master/mod/ffi/fftw.scm> Regards Daniel
